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Simulation of the flat-parallel movement of a bridge agricultural unit with an articulated frame النص الكامل
2020
Bulgakov, V., National Univ. of Life and Environmental Sciences of Ukraine, Kiev (Ukraine) | Ivanovs, S., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Volskyi, V., National Scientific Centre “Inst. for Agricultural Engineering and Electrificationˮ of Ukraine, Hlevakha, Vasylkiv distr., Kiev reg. (Ukraine) | Kuvachоv, V., Dmytro Motornyi Tavria State Agrotechnological Univ., Melitopol, Zaporizhzhia obl.(Ukraine) | Ihnatiev, Ye., Dmytro Motornyi Tavria State Agrotechnological Univ., Melitopol, Zaporizhzhia obl.(Ukraine)
Simulation of the flat-parallel movement of a bridge agricultural unit with an articulated frame النص الكامل
2020
Bulgakov, V., National Univ. of Life and Environmental Sciences of Ukraine, Kiev (Ukraine) | Ivanovs, S., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Volskyi, V., National Scientific Centre “Inst. for Agricultural Engineering and Electrificationˮ of Ukraine, Hlevakha, Vasylkiv distr., Kiev reg. (Ukraine) | Kuvachоv, V., Dmytro Motornyi Tavria State Agrotechnological Univ., Melitopol, Zaporizhzhia obl.(Ukraine) | Ihnatiev, Ye., Dmytro Motornyi Tavria State Agrotechnological Univ., Melitopol, Zaporizhzhia obl.(Ukraine)
The work presents foundations of the dynamics of the flat-parallel movement of a bridge agricultural unit in a horizontal with the kinematic method of its control (turning the wheels) by changing the position of one of its parts relative to the other. The analysis of assessment of the degree of impact of the scheme and parameters of the investigated agricultural tool upon its controllability and stability of movement is based on the amplitude and phase frequency characteristics. The mathematical models of the movement of the bridge agricultural unit are presented in a differential and an operator form of recording. Based on mathematical models, the calculated amplitude and phase frequency characteristics of the dynamic control system of the control impact, presented as the angular displacement of its half-frames ψ, are constructed for various parameters and operating modes. The constructed mathematical models, amplitude and phase frequency characteristics make it possible to assess the impact of the control parameter of the bridge agricultural unit, as well as its design and other parameters upon the controllability of the movement.
اظهر المزيد [+] اقل [-]Simulation of the Flat-parallel Movement of a Bridge Agricultural Unit with an Articulated Frame النص الكامل
2020
The work presents foundations of the dynamics of the flat-parallel movement of a bridge agricultural unit in a horizontal with the kinematic method of its control (turning the wheels) by changing the position of one of its parts relative to the other. The analysis of assessment of the degree of impact of the scheme and parameters of the investigated agricultural tool upon its controllability and stability of movement is based on the amplitude and phase frequency characteristics. The mathematical models of the movement of the bridge agricultural unit are presented in a differential and an operator form of recording. Based on mathematical models, the calculated amplitude and phase frequency characteristics of the dynamic control system of the control impact, presented as the angular displacement of its half-frames ψ, are constructed for various parameters and operating modes. The constructed mathematical models, amplitude and phase frequency characteristics make it possible to assess the impact of the control parameter of the bridge agricultural unit, as well as its design and other parameters upon the controllability of the movement.
اظهر المزيد [+] اقل [-]Simulation of the Flat-parallel Movement of a Bridge Agricultural Unit with an Articulated Frame
Total content of phenolics and antioxidant activity in crispbreads with plant by-product addition النص الكامل
2017
Konrade, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Food Technology | Klava, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Food Technology
The objective of this study is to investigate the stability of total phenolic content (TPC) and antioxidant activity after high temperature and short time (HTST) extrusion cooking of a wheat and rice-based crispbreads with addition of apple, carrot and pumpkin by-products obtained after juice extraction and dried. Raw materials for crispbread production were wheat flour, rice flour, wheat bran (72%, 24% and 4% respectively) with addition of microwave–vacuum dried by-product powder in different amount (5%, 10%, 15%, 20%). Extrusion process was performed by using a laboratory singlescrew extruder GÖTTFERT 1 screw Extrusiometer L series (Germany). Total phenolic content (TPC) was determined using the Folin Ciocalteu method. Antioxidant activity was evaluated by free radical 2, 2-diphenyl-1-picrylhydrazyl (DPPH) antioxidant scavenging activity using a modified colorimetric method. Comparing different raw formulations, it was observed that the TPC of the apple by-product flour was significantly higher (p is less than 0.05) than in carrot and pumpkin flour. TPC in cereal-based crispbread was 36.06±1.15 before extrusion and 13.90±1.01 mg GAEgE-1 DW (milligram Gallic acid equivalent per 100 g of dry weight (mg GAE 100 gE−1 DW) after extrusion. Addition of apple BPF increased TPC in crispbreads to 106.25±2.08, carrot BPF 84.73±3.45 and pumpkin BPF to 108.82±1.04 mg GAEgE−1 DW. Antioxidant activity of control sample was 1.07±0.01mg TE (Trolox equivalents) gE−1 DW but in samples with addition of 20% apple by-products, it reached 3.77±0.02 TE gE−1 DW for samples with 20% carrot by-products reached 2.52±0.03TE gE−1 DW and for samples with 20% pumpkin by-products reached 3.77±0.02 TE gE−1 DW.
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